Ligament tears require a combination of history, clinical symptoms, and ancillary tests. 1. Ligament tears often occur as a result of acute joint trauma (violent impact or twisting of the joint), accompanied by accumulation of blood inside and outside the joint cavity. The knee and ankle joints are the most vulnerable areas for ligament tears. 2. Clinical symptoms of ligament tears (1) Incomplete tear: mild swelling at the torn ligament, localized pressure and pain, and joint stability. (2) Complete tear: in addition to local hematoma and severe tenderness, the joint is often mildly swollen and shows joint instability (abnormal abduction of the joint). (3) A cruciate ligament tear will cause bleeding in the joint cavity, resulting in severe swelling of the entire joint and abnormal anterior-posterior movement of the joint. 3. X-ray radiographs generally do not reveal direct signs of the lesion, while CT and MRI are helpful in the diagnosis of ligament tears. If any of the above medical history or clinical manifestations occur, it is recommended to consult the hospital in a timely manner to complete the above examinations to clarify the degree of injury and target treatment.